Jar



Patented Mar. 15, 1932 IRA J. MCCULLO'UGH, OF HUNTINGTON PARK, CALIFORNIA JAR Application led March 10, l1930. Serial No. 434,556.

This invention relates to a device for use in well drilling operations and relates more particularly to a jarring tool. It is a general lobject of the invention to provide a simple, practical, and eiiective-jarring tool adapted to be used in fishing operations w1th the equipment employed in the rotary method of Well drilling.

Another object of the invention is to provide a jarring tool adapted for use in fishing operations that embodies slackly linked sec-v tions related for limited relative longitudinal movement that are held in a contracted position against relative longitudinal movement b releasable latch means that automatically release the sections for movement upon a predetermined tensile strain being exerted upon the tool.

Another object of the invention is to provide a jarring tool that may be operated without rotating the operating string and without varying the pressure on the fluid in the operating string.

Another object of the invention is to provide a jarring tool of the character mentioned that embodies means whereby the slackly linked sections may be released for relative longitudinal movement upon any desired tensile strain being exerted on the tool.

lt is another object of the invention to provide a jarring tool that is entirely automatic in its operation and that may be operated any number oi times by simple reciprocation of the operating string.

A further object of the invention is to provide a jarring tool in which the parts are all simple and inexpensive of manufacture and in which the jarring parts or members that are brought into jarring or hammering engagement upon the tool being actuated or tripped are inexpensive of manufacture and are replaceable.

Other objects and features of my invention will be best and more fully understood from the following detailed description of a typical :form and application of the invention, throughout which description reference is had to the accompanying drawings, in which:

Fig. 1 is a longitudinal detailed sectional view of the jarring tool illustrating it in the set or contracted position. Fig. 2 is a view similar to Fig. l illustrating the parts in the tripped or actuated position. Fig. 3 is a longitudinal detailed sectional view of the latch means embodied in the tool showing it in the position immediately before being released. Fig. 4 is a transverse detailed sectional v iew taken as indicated by line 4 4 on Fig;k 2. Fig. 5 is a detailed transverse sectional view taken as indicated by line 5-5 on Fig. 2, and Fig. 6 is a detailed transverse sectional view taken as indicated by line 6 6 on Fig. 2.

The tool provided by the present'-.invention is adapted to be employed to eiect a jarring or hammering action. The tool is intended primarily to be employed within a well during fishing operations to impart a jarring action to an object within the well to loosen it so that it can be removed or withdrawn from thewell. Throughout the following description will refer to the tool vas being used in connection with a iishing tool in gripping engagement withaiish or object within a well. It is to be understood that the invention may be employed in various other situations and is not to'be taken as limited to the application or use referred to..

The jarring tool provided by my present invention includes, generally, two main or body sections A and B connected or related for limited relative longitudinal movement, latch means l0. for releasably holding the sections A and B against relative longitudinal movement in a contracted position, and control means 11 for the latch means whereby the latch means is tripped or released upon a predetermined tensile strain being exerted on the tool.

The body sections A and B constitute or form an assembly adapted to be connected between the part or object to be jarred and an operating string. For example, the parts particular A and B are adapted to be connected between y a iishlng tool engaging the object to be j arred 'l5 and an operating string such as a string of drill pipe, or the like. The body sections A and B may be connected between two portions of an operating string at any point above the object to be jarred. The sections ,100

, of a stem extending into the section A.

The section A may include a cap or upper part 12 screw threaded on the upper end of a body section'13. The upper end part 12 mayV 'be detachably connected to the body portion `13 and may have an upwardly projecting screw threaded pin' 14 to facilitate attachment to an operating string, or theflike.

The body portion 13- is an elongated tubular part. A knockersubblockfl is'screwfthreaded into the body portion 13. V The block 15 is f preferably-screw threaded into'the extreme lowerend of the portion`13 and preferably 'has aportion proj ectingv'below `the lower en (l i of the portion 13. lock nut 15 'may beL threaded on the projecting portion of the sub block 15 to yengage' 'the lower end of the part 13 to lock or setthe block inV position. The

l plug-15 is provided with a central vertical or` longitudinal lopening 16.

v'The sectionB `may 'be considered as being l directly connected withja fishing tool orv other device connected with the-object to be jarred.

The section B may consist of a simple unitary member 1.8 slidable-in the opening 16 -of the block 15 and projecting within the portion 13 of the section The flower portion 17 of themember18 lprojects downwardly from the block 15 and may-be provided with any suitable means for vattachment to a fishing tool or a portion of van operatin string, or the like. The portion 17 is pre erably providedwith'splines or keys 19 to slidably operate ingkeyways in the opening 16 to conneetl the body sections A and B against relative` rotation. A sleeve or collar 20 Vis screw threaded onto the portion 17 above the block 15. The collar 2O is -spaced above the upper side of the block 15 when the body'sec'tions A and B are in the contracted or unactuated positions. The lower vend of the collar A20is adapted to cooperate ywith or be struck by the upper--side kof thejblock.' 15 when thelatch means-10 releases thefsectionsA and Bto provide the jarring action...y Inthe'preferred form 'of the, invention I,the portion '17 lis of reduced" diameter to provide a' downwardly facing shoulder 21 andthe upper end ofthe l collar 20 seats against'the shoulder 21,

i "ric-.5

The' member 18-:is''acomparatively 4vloing part *extending j a ,"5 considerable -distance Lthrough the body section A. The portions '17' and 18-of 4the section B are of co siderably less diameter than the interior of t efportion 13 of the section A so that there is provided 25 of the head to limit the relative"longitu `under control of the controlmeanslliupon on the sections A and BJ The-latch'means 10 j A and B and is movable relative tothesec-1'."y

an annular space between theexterior of the section. B and the innergwallsjof the section A. A head 23 isprovided on the upper end 'of the member 18 to slidably operate against the. inner walls of the portion 13.' The lower -70 side 24 of the head 23 is preferably made flat and atright angles to the longitudinal axis of the section B to provide a downwardly facing shoulder. The upper side 25 of the' head 23 is also made flat and at right angles v'I5 to the axis of the section B. The upper end lpart 12 of the body section A is'of reducedv i diameter and presents a downwardly facin shoulder 26 to cooperate with the upper en 8o' dinal movement of the sections A and B one direction.. The lowerend of the"collar. 20 cooperates with the upper'side of 'theb'lock' 15 to limit the relative. longitudinal move ment of the sections A and direction. l l.

.The latch means 10 isl provided.tofrelea'sT ably hold the'sections A and B againstlongiljf: f1 tudinal movement in a contracted position wherethejshoulder on thesectionB, thatijstlj the lower end oflth'e collar 20, iss 'acdfffroin the shoulder on the section A,'`f iihatris" l upper end ofthe b1o 'cl'{.15.=y The latch means. 1() is suchgthat itis automatically'released, j'

a predetermined tensile strain being'ex'erted 1 i* Bi inf @he .other-eff includes a cage or carrier 28,latches ;f2 9.,on the carrier, anda shoulder `3 0 on Vone o'fthef, sections A or B adapted tol cooperate 'with or 10o be engaged by the latches 29. The latch-,cage f `L or carrier 28 is supported on one ofthe bodyf sections A or B through the control-means 1l so that the latches 29 are adaptedto -cooperate'lwith the shoulder 3() on the otherbody sec"j1'o5, tion to releasably hold the sections i'nthe'iV contracted position. The latchesl29jare "car,- ried through the carrier 28 and the.kcontrol` means 1l so that they are released'fromf'th'e shoulder 30 upon the control means .11 being-" acted upon by a predeterminedltensile strain-y-. to shift the latches 29 relativejtof thel body section which supports them. In the partieular embodiment of the invention illustratedf'- in the drawings the latches 29 arefmountedf115 on the section A through the control-meansf- 11 to cooperate with the shoulder"- 30,011` the ft section B. The carrier 28 isarranged in thespace bei f tween the. exterior of the member;1 8 of `the section B and the inner walls of thfe'porti on 13 of the section A. The carrier- 28 fis shift-ff f ably or slidably mounted between `t he' sections tions under control of the mean'sfill carrier 28 is an annular or tubular ypa "pro-.1.- vided with a central opening' slidja-bly'. passing the member 18 of the body section B. v The exterior of the upper end'of thecar t' 28 is slidable on the inner'vwallsof the' or tion 13 of the section A, while the exterior of the lower portion of the carrier 28 is slidable ou an annular liange or part 32 on the interior ofthe portion 13. 'lhe upper end 33 of the flange 32 provides an upwardly facing shoulder which is beveled or tapered downwardly1 and inwardly forming a cam face to cooperate with the latches 29 as will be hereinafter described.

The latches 29 are mounted in longitudinal slots 34 in the walls of the carrier 28. There may be any desired number of latches 29. In the particular case illustrated there are four latches equally spaced around the central axis of the carrier. The latches 29 are preferably pivotally mounted in the slots 34. A pivot pin 35 extends transversely between the walls of each slot 34 and extends through transverse openings in the latches 29 to pivotall;7 mount the latches in the slots. T he pins 35 extend through the latches 29 at points adjacent their lower ends. rlhe upper ends of the latches 29 are adapted to engage or cooperate with the shoulder 3() on the section B and are preferably made round so as to readily move or operate od the shoulder. The lower ends of the latches 29 are made round or provided with cam faces 37 to engage the cam face 33 so that an inward thrust is imparted to the lower ends of the latches to shift the upper ends of thelatches outwardly when a predetermined strain is exerted on the sections and B.

T he shoulder 30 is a downwardly facing shoulder on the member 18 of the body section B. ln accordance with the preferred wardly tapered to permit the upper ends of the latches 29 to readily operate from it upon the cooperation of the cam faces 33 and 37.

The upper end of the collar 38 may seat against a downwardly facing shoulder on the member 18.

Means is provided for yieldingly urging the upper ends of the latches 29 toward or into engagement with the shoulder 30. A leaf spring may depend or project downwardly into each slot 34 to engage the latches 29. The

springs 40 are curved inwardly and formed to engage the outer sides of the latches-29 to urge the upper ends of the latches inward.-

The springs 40 operate to return the latches to their normal or set positions after actuation.

The control means 11 operates to control the release of the latch means 10 by supporting the carrier 28 so that the cam faces 37 of the latches engage the cam shoulder 33 upon a predetermined tensile strain being exerted on the sections A and B. The control means 11 is in the. nature of compressible or yielding means that is compressed or contracted upon a given tensile strain being exerted on the body sections A and B so that the carrier 28 and the latches 29 are moved or shifted relative to the section A. The control means 11 includes a compressible member or members 42 mounting or supporting the carrier 28 on the section A. The member 42 in the case illustrated mounts vthe carrier 28 on the sub block 15. The compressible part 42 may be an elongated tubular member surrounding the section B having its upper end attached to the carrier 28 and its lower end attached tothe block 15. The upper end of the compressiblc part 42 may seat in an annular recess 43 in the lower end of the carrier 28, while the lower end of the compressible member may seat in an annular recess 44 in the block 15. rl`he part 42 may be secured to the block 15 by suitable screws 45. The part 42 is preferably corrugated annularly or circumferentially as clearly illustrated in the drawings. lf desirable the part 42 may have a plurality of spaced longitudinal slots 48. The slots may extend from one end of the part to its other end and render the part more flexible. The slots 48 divide the compressible part 42 sov that it forms a multiplicity of compressi-- ble springlile portions. The part 42 normally supports the carrier 28 on the section A so that the lower cam ends 37 of the latches 29 are spaced from the cam shoulder 38. When compressed to a certain degree through a tensile strain exerted on the sections A. and B, the lower ends of the latches 29 are brought into engagement with the cam shoulder 33 as illustrated in Fig. 3 of the drawings. rlthe portion 13 of the sectional also stretches or is elongated under the tensile strain so that the combined move-ment of the shoulder 33 of the section A in one direction and the movement of the carrier 28 in the other direction caused by compression of the member 42` brings the lower ends of the latches into engagement with the shoulder 33.

Means is provided for circulating fluid through the tool and in the form of the invention shown the upper end 12 of the section A is provided with an opening 50 to receive fluid from an operating string, or the like, which discharges into the interior of the portion 13. The section B is provided with an opening or passage 51 extending longitudinally through it from one end of it to the other to deliver the lcirculation fluid to the fishing tool or other device attached to the lower end of the section B.

A shiftable ring or annular block may be arranged in the .annular space between the portion 18 of the section B and the interior of the section A above the carrier 28. The block 60 is freely arranged within the section A and is movable between the upper end of the carrier 28l and the lower side 24 of the -head,23. The block 60 is entirely unattached vand upon release of the latch means the block is thrown against the lower side 24 of 5 the head 23 to impart an added upward blow or jarring action to the section B.

It is believed that the operation of the tool provided by the present invention will be readily understood fromA the foregoing de- 1 0 positions illustrated in Fig. 1 of the drawings, a tensile or longitudinal strain may be exerted on the sections A and B by pulling upwardly on the section A by means of a ishingstring or pipe, or the like, wwhen the section B is held stationary through attachment with a fishing tool engaging a stationary object. Upon a certain predetermined strain being exerted `on-the sections A and B, for example, a certain upward strain being exerted on the section -A while the section-B is held stationary, the'vcom'pressible part or parts 42 of the means s 11 will'be contracted orV compressed to a certain extent and the portion 13 of the section Awill belengthened or stretched. This compression `-oflthe part or parts 42 and the y elongation of the portion 13'c'auses movement Vof Jthe-:'aI n shoulder 33 relative to the lower ""endsjo'f'fthe 'latches 29.`to bringe-these cam ,imparts into engagement. Engagement of the Team ac'es' 37 and 33 while ythe ,tensile strain is'. beingv exerted. on theA tool causes the lower ".Eendsof the `latches 29 to .bejurged inwardly f to Swing-the upper ends of-Lthe latches out of f latches29 are released from the shoulder yin this `manner the -sectionsA and 'B lmove rela- "tiveftoone another4 tofbring'the lower end of vthe collar 20 and the' upper side of the knocker bloclrl. into engagement.' 4 The block 60 isal'f o thrown into engagement wifththe lower ide24 of thell'ead-Q.

Y' In 'practicev thesection Bis usually stationvrypalidthe' operating'string to which the ection-A lis attached 'is elongated or stretched hrough"thettensilestrainand tends to conf latches29 relative to the shoulder 33.

- AHaving.described onl a typical preferred ormpf my'invention, do not wish to limit tailed description. With the parts in the .engagement with the shoulder 30. When the" ractor returnvto'itsfnormal condition upon Vtvided by this'invention embodies but few myself to the specific details set forth, but wlsh to reserve to myself any changes or variations that may appear to those skilled in the art or fall within the scope of the followin claims.

aving described my invention, I claim:

1. A well tool of the character described including, two sections connected for limited relative longitudinal movement, latch means for releasably holding the sections against relative movement, and control means whereby the latch means is released upon a predetermined strain being applied to the sections to cause relative longitudinal movement between them including, .an elongated corrugated yielding part supporting the latch means on one section. Y

2. A well tool of the character described including, two sections, one a tubular section, the other a stem section extending into the tubular section, the sections being related for limited relative longitudinal movement, a latch within the tubular section, a corrugated compressible part releasably holding the latch where it holds the sections against relative movement, and means for releasing the latch upon compression of the said part through a predetermined strain being exerted on the sections. j

3. A well tool including two.A relatively movablesections connected for limited'longitudinal' movement, means l releasably yholding thesections against relative movement, and

control means whereby the said means is released upon a predetermined tensile strain being put on the sections, the. control means including a corrugated yielding partv supporting said means on' one 'of the sections.

4. A. well tool including ftwo relatively movable sections connected for limitedlongitudinal movement, means releasablylholding the sections against relative movement, and control means whereby the said'mean's is released upon a predetermined'tensile strain lbeing put on the sections, thecontrol 'means including a tubular corrugatedpart yieldingly supportingsaidjmeans on onef the, sections. f y v 5. A well 'toolIincluding,two-,sections related fory relative longitudinahmovement,,a latch, a ylelding 'corrugated "p'artlnormally supportingthelatchn one 'section ili-alposi- 4.

tion wherel it releasably A holdsl 'theirv sections against relative movement, and cam n 1,e`ja ns.."V

operable to release the latch up'fon'a'jpredetermined strain being exerted on the sections to 1 cause yielding ofsaidfpart.

6. A well tool includ'ng,twosectionsrelated -for limited relative longitudinal movement, a latch, a shoulder on onejse'ctiom a' slotted tubular compressible lpart normally supporting the latch in a yposition in engagement with thel shoulder to. releasably hold the `sections against movement, and 'cam means operable to vshift the latch out of engagement with the shoulder upon a predetermined strain being exerted on the sections to compress said part.

7. A well tool of the character described including, two body sections related for relative long1tudinal movement a shoulder on one section, a latch, a yielding corrugated part mounting the latch on the other section adapted to yield to allow relative movement between the latch and said other section, and cam means for disengaging the latch from the shoulder upon said relative movement between the latch and said section.

8. A well tool including, two body sections related for relative longitudinal movement, a shoulder on one section, a latch, a corrugated tubular compressible part normally supporting the latch on the other section wherev it engages the shoulder to hold the sections against relative movement and adapted through compression to permit relative movement between the latch and the said other section, and cam means for disengaging l the latch from the shoulder upon said re1ative movement of the latch and section. 9. A well tool including, two sections, one

a tubular section, the other a stem section extending into the tubular section, a shoulder on the stem section, a zivo'ted latch, a come pressible part surroun ing the stem sectionA and supporting the latch on the tubular sec-effr1i tion where it releasably engages the shoulder to hold the sections against relative move ment and compressible to permit relative i movement between the latch and the tubular section, and a cam face on'the tubular section to cooperate With the latch UPOD, Said relatifve movement between the latch and the section to disengage it from the shoulder.

40 10. A jarring tool including, a tubular section, a stem section extending into the tubular section and having a, shoulder the sections being related for limited relative lon tudinal movement, a block movable in t e tubular section, a pluralit r-vof latches ivotally mounted on the bloc Vand o ra le'tol engage the shoulder, a compressib e member mounting the block in the tubular section, vso that the latches normally engage the shoulder to hold the sections against relative movement, and a cam face on the wall of the tubular section for enga ing the latches to re- Ilease them from the s oulder when the member is compressed upon a predetermined strain being put on the sections.

In witness that I claim the foregoing I have hereunto subscribed my name this 5th day of March, 1930.

IBA J. MCCULLOUGH. 

